The Federal Energy Regulatory Commission on June 25 approved a three-year preliminary permit for CB Energy Park LLC for a 250-MW pumped storage hydro project in Montana.
In December 2013, CB Energy Park filed an application for a preliminary permit that would allow it three years of exclusivity to study the feasibility of the proposed Coffin Butte Pumped Storage Hydro Project, to be located near Two Dot in Wheatland County, Mont. A license application would be needed to advance the project further.
The project would include upper and lower reservoirs, and a powerhouse containing two reversible 125-MW turbine/generator units for a total installed capacity of 250 MW. There would also be an approximately 2-mile-long, 230-kV transmission line connecting to an existing 500-kV transmission line in the area, or a 7-mile-long, 230-kV transmission line connecting to the existing Two Dot substation.
The proposed project would have an average annual generation of 880,000 megawatt-hours.